A multi-functional fitness device comprises a first supporting seat, a second supporting seat and a sphere. The first supporting seat and the second supporting seat are respectively provided with a first concave spherical surface and a second concave spherical surface matched with an outline of the sphere, and are oppositely arranged, with the sphere supported therebetween, two sides of the sphere are partially fitted and embedded into the first concave spherical surface and the second concave spherical surface respectively, at least one of the first supporting seat and the second supporting seat is movably connected to a surface of the sphere through the corresponding first concave spherical surface or second concave spherical surface, and adhered to the surface of the sphere to move, and an elastic member is connected between at least one opposite side edges of the first supporting seat and the second supporting seat.